1352381257 has 4 divisors (see below), whose sum is σ = 1354168516. Its totient is φ = 1350594000.

The previous prime is 1352381249. The next prime is 1352381281. The reversal of 1352381257 is 7521832531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7521832531 = 23 ⋅327036197.

It can be written as a sum of positive squares in 2 ways, for example, as 424813321 + 927567936 = 20611^2 + 30456^2 .

It is a cyclic number.

It is not a de Polignac number, because 1352381257 - 2³ = 1352381249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1352381207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892494 + ... + 894007.

It is an arithmetic number, because the mean of its divisors is an integer number (338542129).

Almost surely, 2^1352381257 is an apocalyptic number.

It is an amenable number.

1352381257 is a deficient number, since it is larger than the sum of its proper divisors (1787259).

1352381257 is an equidigital number, since it uses as much as digits as its factorization.

1352381257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787258.

The product of its digits is 50400, while the sum is 37.

The square root of 1352381257 is about 36774.7366679899. The cubic root of 1352381257 is about 1105.8588920254.

The spelling of 1352381257 in words is "one billion, three hundred fifty-two million, three hundred eighty-one thousand, two hundred fifty-seven".